#include "head.h"
#include <iostream>

int main()
{
    int a = 1, b = 2;
    printf("a+b=%d", add(a, b));
    printf("a-b=%d", sub(a, b));
    printf("a*b=%d", mul(a, b));
    printf("a/b=%d", divv(a, b));
    return 0;
}